Answer / anchal

coz at the start the slip is maximum,
Rotor conductors are stationary in the beginning and the relative speed between the rotor conductors and rotating magnetic field is maximum, and hence emf across rotor conductors is max in the beginning(e=blv) means current is max, as the rotor starts rotating the relative speed becomes less and hence does emf and current.

Answer / sunil guru

AT START THEIR EXIST MAGNETIC FIELD & THE ELECTRIC FIELD IS ABSENT AND COMBINATION OF BOTH PRODUCES THE TORQUE AND ROTATES THE ROTOR...
TO PRODUCE THE FLUX IN THE CLOSE CIRCUIT OF THE ROTOR MOTOR CONSUMES THE CURRENT AND WITH THE CUTTING OF FLUX EMF IS GENERATED THEN THE GENERATED EMF IS CALLED BACK EMF OR COUNTER EMF .... AFTER THE PRODUCTION OF BACK EMF IT NEUTRALISE'S WITH SUPPLY VOLTAGE AND THEN WITH THE STAGE OF NORMAL RUNNING OF MOTOR THE CURRENT CONSUMPTION REDUCES...

SO AT START WITH THE WORK OF SETTING OF FLUX AND TO OVERCOME THE LOSSES THE STARTING CURRENT IS ALWAYS HIGH...

FOR ANY DISAGREEMENT MAIL ME AT parmar20072008@yahoo.com

Answer / praveen kumar.bodu

when motor is off. it consists of some back emf in it.and
also it appears like a short circuited i.e it has a full
load connection. at the time of start motor again it is not
possible to run motor initially when fulload isconnected.so
motor sinks more current.

Answer / viren

When motor at rest, the motor appears to be a transformer, with it's secondary winding short circuited, i.e. the rotor winding or squirrel cage is a closed circuit. This results in a low impedance to the system voltage and the motor has a "locked rotor" current of typically 6 times full load current, but also up to 8 and sometimes 10 times current.

Answer / ali_asgher107

Because at the starting of induction motor, the emf is zero

why dc series motors never start without some load, and what will happen if starting with out load..

1 Answers  

can any tell me why slope 40% and 80% is calculated in differential protection?

0 Answers  

what is fault level in 66kV system?

3 Answers  

what is rotor earth fault protection scheme in hydro generator & what is dc field flashing ?

2 Answers   NHPC,

what is LDR used in street light

2 Answers   Cipla, Ram Infotech, Wipro,

Differenciate between circuit wiring and sub main wiring with illustrations

0 Answers   MU,

How much current can carry the 1 sq inch super enamelled copper wire?

4 Answers  

The company is wiling to buy you 5 pcs of equipments in your electrical tool kit. Plz tell what are the 5 things you want?

3 Answers  

without name plate detail of blower how we can find out the HP & Rpm ? the input voltage is 230v single phase

1 Answers  

how a synchronous motor is used as a resistor,capacitor and an inductor?

3 Answers   Technocon Services,

Which capacitor is used in ceiling fans ?

1 Answers  

How a capacitor discharge weld power supply works? what is the use of a pulse transformer?

0 Answers